Stop Collar for Forstner Bits

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Stop Collar for Forstner Bits

For projects requiring several different-sized holes drilled to precise depths, I like to set up stop collars on the bits required rather than constantly changing the depth stop on my drill press. The collars work well on regular drill bits, but their outer diameter is often too small to work with a Forstner bit. I've found that drilling a hole in a 1/4" plywood “washer” and sliding it to the desired depth between the collar and the bit's cutting end works with even the biggest of my collection. This trick also works well when using Forstner bits on the lathe.

Jeff Peters
Redgranite, Wisconsin

Improving Drilling Precision with Forstner Bits

Jeff's clever use of a plywood spacer brings new versatility to the stop collar, especially when working with Forstner bits. This woodworking hack is especially helpful when drilling into hardwood or end grain, where precision is key. Since Forstner bits excel at producing clean, flat-bottomed holes, they're often used in joinery and furniture making. Adding a stop collar setup like this makes repeatable depth control easier without relying solely on your drill press depth gauge.

Woodworking Tips and Tricks for Consistent Results

This idea represents the kind of woodworking tips and tricks that can make a real difference in your shop. Even a single, well-executed adjustment like Jeff's use of a plywood spacer with a stop collar can streamline setups and improve drilling accuracy. Keep a few pre-drilled "washers" near your drill press or lathe to make the most of your Forstner bits without added expense.

A Simple Woodworking Hack You’ll Use Often

Stop collars are typically made for twist bits, but with a little creativity, they can work just as well on larger-diameter cutters. This woodworking hack doesn't require expensive upgrades or special jigs, just basic materials and a smart approach like Jeff's.

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